\documentclass[landscape]{article}
\setlength{\pdfpagewidth}{11in} \setlength{\pdfpageheight}{8.5in}
\begin{document}
\begin{tabular}{lcccccccccccccccccccccccc}
\multicolumn{25}{c}{Effect} \\
\multicolumn{25}{c}{)} \\ \hline
 & (1) & (2) & (3) & (4) & (5) & (6) & (7) & (8) & (9) & (10) & (11) & (12) & (13) & (14) & (15) & (16) & (17) & (18) & (19) & (20) & (21) & (22) & (23) & (24) \\
 & changepop1400 &  & changepop13001600 &  & changepop1400 &  & changepop13001600 &  & changepop1400 &  & changepop13001600 &  & changepop1400 &  & changepop13001600 &  & changepop1400 &  & changepop13001600 &  & changepop1400 &  & changepop13001600 &  \\
VARIABLES & coef & se & coef & se & coef & se & coef & se & coef & se & coef & se & coef & se & coef & se & coef & se & coef & se & coef & se & coef & se \\ \hline
 &  &  &  &  &  &  &  &  &  &  &  &  &  &  &  &  &  &  &  &  &  &  &  &  \\
changepop1400 & . & [.] &  &  & . & [.] &  &  & . & [.] &  &  & . & [.] &  &  & . & [.] &  &  & . & [.] &  &  \\
mortality & -0.87*** & [0.28] & 0.36 & [0.80] & -0.77** & [0.33] & 0.42 & [0.98] & -1.06*** & [0.32] & 0.27 & [0.88] & -1.15*** & [0.40] & 0.05 & [0.77] & -0.84*** & [0.28] & 0.38 & [0.82] & -0.95*** & [0.29] & 0.42 & [0.82] \\
 &  &  &  &  &  &  &  &  &  &  &  &  &  &  &  &  &  &  &  &  &  &  &  &  \\
changepop13001600 &  &  & . & [.] &  &  & . & [.] &  &  & . & [.] &  &  & . & [.] &  &  & . & [.] &  &  & . & [.] \\
 &  &  &  &  &  &  &  &  &  &  &  &  &  &  &  &  &  &  &  &  &  &  &  &  \\
Observations & 165 &  & 164 &  & 126 &  & 125 &  & 134 &  & 133 &  & 138 &  & 137 &  & 144 &  & 143 &  & 147 &  & 146 &  \\
R-squared & 0.12 &  & 0.00 &  & 0.10 &  & 0.00 &  & 0.19 &  & 0.00 &  & 0.14 &  & 0.00 &  & 0.12 &  & 0.00 &  & 0.14 &  & 0.00 &  \\
 test & wo &  & wo &  & wo France &  & wo France &  & wo Germany &  & wo Germany &  & wo Italy &  & wo Italy &  & wo UK &  & wo UK &  & wo Spain &  & wo Spain &  \\ \hline
\multicolumn{25}{c}{ Robust standard errors clustered at the district level in parentheses} \\
\multicolumn{25}{c}{ * significant at 10\%; ** significant at 5\%; *** significant at 1\%} \\
\end{tabular}
\end{document}
